GIK GigCapital3 Inc

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Filed Pursuant to Rule 424(b)(3)
Registration No. 333- 257237

LIGHTNING EMOTORS, INC.

SUPPLEMENT NO. 3 TO

PROSPECTUS DATED JULY 8, 2021

THE DATE OF THIS SUPPLEMENT IS AUGUST 31, 2021

This prospectus supplement (this “Supplement No. 3”) is part of the prospectus of Lightning eMotors, Inc. (the “Company”), dated July 8, 2021 (as amended from time to time, the “Prospectus”). This Supplement No. 3 is being filed to update and supplement the information contained in the Prospectus with the information contained in our Current Report on Form 8-K filed with the Securities and Exchange Commission on August 31, 2021 (the “Current Report”). Accordingly, we have attached the Current Report to this prospectus supplement.

This prospectus supplement updates and supplements the information in the Prospectus and is not complete without, and may not be delivered or utilized except in combination with, the Prospectus, including any amendments or supplements thereto. This Supplement No. 3 should be read in conjunction with the Prospectus and if there is any inconsistency between the information in the Prospectus and this Supplement No. 3, you should rely on the information in this Supplement No. 3.

Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties described under the heading “Risk Factors” beginning on page 7 of the Prospectus and in Section 1A. Risk Factors of our Quarterly Report for the quarterly period ended June 30, 2021 before buying our common stock and warrants.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

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UNDER

THE SECURITIES ACT OF 1933

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 31, 2021

Lightning eMotors, Inc.

(Exact name of registrant as specified in its charter)

815 14th Street SW, Suite A100

Loveland, Colorado 80537

(Address of principal executive offices, including zip code)

1-800-223-0740

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

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On August 31, 2021, the Company announced that it had entered into a Development and Supply Agreement with Collins Bus Corporation (the “Agreement”). A copy of the Company’s press release related to the Agreement is attached as Exhibit 99.1 to this Current Report and is incorporated herein by reference. A copy of the Agreement is attached as Exhibit 99.2 to this Current Report and is incorporated herein by reference.

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